My Mother in Mi Vida Loca

I don't know how much her poor body can take. She is always tired, always bitchy, always sick, and always going off on me like the shit is my fault. I try to take care of her, and do for her, but no matter what I do it is never good enough. I love my mom, but like most people I feel inadequate when it relates to her. I feel like running away sometimes, but I know I am all she has, and that no one else will take care of her. She knows it too and I often feel like she takes advantage of that. But, what do you do? She is dying for fucks sake.